Respiratory mask



FIG. 1 is a front perspective view of a respiratory mask according to a first embodiment of our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof with the right side view being a mirror image;

FIG. 7 is a front perspective view of a respiratory mask according to a second embodiment of our design;

FIG. 8 is a front view thereof;

FIG. 9 is a rear view thereof;

FIG. 10 is a top view thereof;

FIG. 11 is a bottom view thereof; and,

FIG. 12 is a left side view thereof with the right side view being a mirror image.

The broken lines in the drawings illustrate portions of the respiratory mask that form no part of the claimed design.

Line shading and stippling have been used in the drawings to indicate a contrast in appearance. 

CLAIM The ornamental design for a respiratory mask, as shown and described. 